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Old 08-26-2004, 07:34 AM   #1 (permalink)
spamfree@nospam.com
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Default Should fuel filter always be full?

I got a 79 pickup with a 400 engine. I noticed that the clear fuel
filter fills with gas, then goes nearly dry and fills again (while
engine is running). Is this normal? Shouldn't the filter be
constantly filled? I also have a problem where the truck acts like
it's going to die from a lack of gas, particularly under load and on
hills. I am wondering if the fuel pump may be weak..... ????
The carb was rebuilt about a year ago, and is tight to the block with
no vacuum leaks, since I just replaced all the vacuum hoses.

Whether I rev the engine, or it's at idle, that filter tends to fill
and empty regularly.


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Old 08-26-2004, 07:34 AM   #2 (permalink)
scroob
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Default Re: Should fuel filter always be full?

spamfree@nospam.com wrote in
news:7dlvc0d036ji3pfb6uuapsa6hqr31k9u9u@4ax.com:

> I got a 79 pickup with a 400 engine. I noticed that the clear fuel
> filter fills with gas, then goes nearly dry and fills again (while
> engine is running). Is this normal? Shouldn't the filter be
> constantly filled? I also have a problem where the truck acts like
> it's going to die from a lack of gas, particularly under load and on
> hills. I am wondering if the fuel pump may be weak..... ????
> The carb was rebuilt about a year ago, and is tight to the block with
> no vacuum leaks, since I just replaced all the vacuum hoses.
>
> Whether I rev the engine, or it's at idle, that filter tends to fill
> and empty regularly.
>
>


Your truck is showing signs of a weak fuel pump. Check it out quickly,
because if the diaphragm is ruptured, your crankcase could be filling with
gas.

 
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Old 08-26-2004, 07:34 AM   #3 (permalink)
MikeHunt2@mailcity.com
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Default Re: Should fuel filter always be full?

It does not go 'dry' it is filled with gasoline and its vapors.
What you have is a fuel pump that 'pulls' fuel
to the carburetor, 'gases' unlike liquids compress. When
the pressure drops some of the gasoline turns to a vapor within
the filter housing. Newer vehicles that 'push' fuel from the
tank to the injectors and are therefore not subject to vapor lock
of yore.

mike hunt




spamfree@nospam.com wrote:
>
> I got a 79 pickup with a 400 engine. I noticed that the clear fuel
> filter fills with gas, then goes nearly dry and fills again (while
> engine is running). Is this normal? Shouldn't the filter be
> constantly filled? I also have a problem where the truck acts like
> it's going to die from a lack of gas, particularly under load and on
> hills. I am wondering if the fuel pump may be weak..... ????
> The carb was rebuilt about a year ago, and is tight to the block with
> no vacuum leaks, since I just replaced all the vacuum hoses.
>
> Whether I rev the engine, or it's at idle, that filter tends to fill
> and empty regularly.

 
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